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Performance Assessment of Steel Moment Connections Retrofitted With Various Reduced Section Patterns

Sivandi-Pour Abbas

Civil and Environmental Engineering Reports

2019

Vol. 29, no. 4

1--17

It is of high importance in seismic retrofitting of lateral load-bearing systems to increase the connections performance. The crucial point in the steel frame retrofitting process is to create plastic hinges in these types of frames. The formation of plastic hinges in beams and near columns generates large strains on column flanges as well as welding metal and heated surroundings, which can lead to brittle failure. The connection should be designed in such a way as to allow plastic hinge formation at certain points of the beam. One such method suggested for retrofit connections is to reduce the beam section locally away from the connection zone. There are various patterns available to locally reduce the beam section, such as circular, elliptical, and symmetric/asymmetric. In recent years, different proposals have been presented to design these connections which vary from older instructions. For this study, radiused cuts in the flange and slotted holes in the web of connection beams were selected for retrofitting analysis. Cyclic behavior, energy damping levels, and ductility of these connections were studied and compared before and after the retrofit by using nonlinear dynamic analysis. The results showed that the symmetrical circular hole pattern in the beam flanges demonstrated reliable performance.

Effective damping of energy flow in 3D biomechanical human – breaker systems with the application of WoSSO vibration damping

Dobry M. W.

Vibrations in Physical Systems

2012

Vol. 25

123--128

The article concerns the dynamic energy analysis in a Human–Breaker (H–B) system with the application of spatial WoSSO vibration damping. The analysis required the development of a spatial mathematical energy model of a biomechanical system in which the Constant-Force Vibration Damping (WoSSO) system is applied; this model was solved by means of a simulation prepared with the use of a special programme created with the MATLAB/simulink software. The obtained results indicated that the innovative WoSSO system applied in this case effectively dampens the flow of energy to the human operator while retaining the full energy of blows to the base under the breaker.